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EP0899899B1 - Gerät und Verfahren zur Teilung eines Signalisierungskanals - Google Patents

Gerät und Verfahren zur Teilung eines Signalisierungskanals Download PDF

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Publication number
EP0899899B1
EP0899899B1 EP98306557A EP98306557A EP0899899B1 EP 0899899 B1 EP0899899 B1 EP 0899899B1 EP 98306557 A EP98306557 A EP 98306557A EP 98306557 A EP98306557 A EP 98306557A EP 0899899 B1 EP0899899 B1 EP 0899899B1
Authority
EP
European Patent Office
Prior art keywords
signaling
base station
uplink
channel
base stations
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98306557A
Other languages
English (en)
French (fr)
Other versions
EP0899899A3 (de
EP0899899A2 (de
Inventor
Miguel Dajer
Harvey Rubin
Mark H. Kraml
Keith Elden Strege
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia of America Corp
Original Assignee
Lucent Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lucent Technologies Inc filed Critical Lucent Technologies Inc
Publication of EP0899899A2 publication Critical patent/EP0899899A2/de
Publication of EP0899899A3 publication Critical patent/EP0899899A3/de
Application granted granted Critical
Publication of EP0899899B1 publication Critical patent/EP0899899B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/12—Interfaces between hierarchically different network devices between access points and access point controllers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • This invention relates to methods for sharing a communication channel in a wireless communication system.
  • Each of the T1 facilities 16- i includes a downlink path 17- i and an uplink path 19- i , as shown in FIG. 2, for the transmission of data to and from the base stations 14- i , respectively.
  • Each of the paths 17- i , 19- i is configured into a channelized format-that is, the paths are divided into transmission time slots.
  • FIG.3 illustrates a manner for channelizing the paths 17- i , 19- i .
  • the wireless communication system 10 has a 24 ⁇ n number of DS0 j time slots in the downlink direction and 24 ⁇ n number of DS0 j time slots in the uplink direction.
  • the DS0 j time slots are used to form communication channels, including a signaling channel and a plurality of traffic channels.
  • Each communication channel includes at least one DS0 j time slot in the downlink path 17- i and the uplink path 19- i .
  • a DS0 j time slot shall be hereinafter deemed to refer to both a DS0 j time slot in the downlink path and a DS0 j time slot in the uplink path, unless otherwise specified.
  • Each of the base stations 14- i uses x number of DS0 j time slots as a signaling channel for transmitting control information between the base station 14- i and the BSC 12, where x ⁇ 1.
  • Each of the base stations 14- i can support enough user traffic to consume p number of traffic channels (for transmitting the user traffic between the base station 14- i and the BSC 12 and a voice switch, not shown), wherein a traffic channel comprises y number of DS0 j time slots and y ⁇ 1.
  • each of the T1 facilities 16- i has a bandwidth that includes more than q number of DS0 j time slots - that is, the user traffic supported by an individual base station (and the control information) does not consume the entire bandwidth available on a T1facility (i.e., q ⁇ n).
  • the base station does not use some DS0 j time slots resulting in inefficient utilization of the T1 facility.
  • FIG. 4 illustrates a wireless communication system 20 in which a daisy chain configuration is used to connect n number of base stations 22- i to a BSC 24 via a common T1 facility 26.
  • the wireless communication system 20 has a total of 24 number of DS0 j time slots (compared to 24 ⁇ n number of DS0 j time slots in the wireless communication system 10).
  • each of the base stations 22- i has its own signaling channel comprising x number of DS0 j time slots - that is, n ⁇ x number of DS0 j time slots on the T1 facility 26 are used as signaling channels.
  • the remaining DS0 j time slots in the T1 facility 26, i.e., m-n ⁇ x, can be used as traffic channels.
  • the number of remaining DS0 j time slots should be at least equal to the total number of DS0 j time slots needed by the base stations 22- i to support user traffic, i.e., 24-n ⁇ x ⁇ y ⁇ p ⁇ n.
  • n represents the total number of base stations
  • x represents the number of DS0 j time slots composing a signaling channel
  • y represents the number of DS0 j time slots composing a traffic channel
  • p represents the number of traffic channels consumable by user traffic per base station.
  • each base station 2- i has its own signaling channel (for a total of five DS0 j time slots), then there would only be nineteen DS0 j time slots available for use as traffic channels by the five base stations. Since each base station supports enough user traffic to consume four traffic channels, twenty DS0 j time slots are needed by the wireless communication system for traffic channels. Because the T1 facility has only nineteen DS0 j time slots available for use as traffic channels, the needs of the wireless communication system 20 would exceed the capacity of the T1 facility.
  • One way to increase the number of DS0 j time slots available for use as traffic channels is to use additional T1 facilities. Such a solution would undesirably increase the cost of the wireless communication system. Accordingly, there exists a need for increasing the number of DS0 j time slots available for use as traffic channels in a T1 facility connecting two or more base stations to abase station controller.
  • US-A-5313461 relates to a method and device in a digital communication network for connecting two or more peripheral stations to a central station over a common service resource.
  • the capacity of the common service resource is divided into a series of frames, and information can be dynamically added to the free capacity of a frame. Additionally, redundant information between frames is eliminated to free up extra capacity.
  • the present invention provides an apparatus and a method for increasing the number of DSO j time slots available for use as traffic channels in a T1 or E1 facility connecting two or more base stations to a base station controller by sharing a signaling channel among the base stations.
  • the present invention is based on the concept that a single base station does not utilize the entire bandwidth of the signaling channel for the transmittal of signaling messages, i.e., control information for managing resources at one or more base stations. Better utilization of the signaling channel bandwidth can be achieved if two or more base stations can share the same signaling channel which, in turn, results in making more DS0 j time slots available for use as traffic channels.
  • the wireless communication system should be configured such that each of the base stations can receive its signaling over a downlink the signaling channel, and transmit its signaling messages to the base station controller over an uplink signaling channel without interfering with signaling messages transmitted by other base stations over the uplink signaling channel.
  • the base station controller transmits over the downlink signaling channel a downlink signaling message with an associated identifier which specifies the base station to which the signaling message is intended.
  • Each of the base stations bridges or taps onto the transmission facility to receive the downlink signaling message and identifier. This permits downlink signaling messages and identifiers to pass transparently through the receiving base station and to other base stations in the wireless communication system.
  • the receiving base station examines the identifier to determine whether the associated downlink signaling message is intended for that base station. If yes, the base station executes instructions contained within the downlink signaling message. Otherwise, the downlink signaling message is ignored.
  • each of the base stations transmits its uplink signaling message to the base station controller without interfering (e.g., overwriting) with uplink signaling messages transmitted by other base stations.
  • the base station receives uplink signaling messages (and associated identifiers) transmitted by other base stations over the uplink signaling channel to the base station controller.
  • the receiving base station stores the received uplink signaling message in memory associated with that base station. Also stored within the same (or different) memory may be an uplink signaling message (and identifier) generated by the receiving base station for transmission to the base station controller. Any signaling messages stored in the memory of the receiving base station is then transmitted to the base station controller on a "first-in, first-out" basis over the uplink signaling channel. Hence, signaling messages from all base stations in the wireless communication system are assured of being transmitted to the base station controller.
  • the base stations 32- i are connected to the BSC 34 in a daisy chain configuration using a common T1 facility 36 configured in a channelized format.
  • FIG. 6 illustrates the data formats for transmissions over the downlink and uplink paths 37, 39 of the T1 facility 36.
  • transmissions include a predetermined sequence of bits (referred to herein as framing bits). These framing bits provide a point of reference for determining the beginning of a frame.
  • transmissions include additional framing bits for indicating the beginning of the signaling channel and one of the following: a downlink or uplink signaling message with an identifier for specifying a particular base station; or flag characters indicating the absence of signaling messages.
  • the identifier specifies a base station to which the associated downlink signaling message is intended.
  • the identifier specifies a base station from which the associated uplink signaling message was transmitted.
  • transmissions include additional framing bits for indicating the beginning of a particular traffic channel, downlink or uplink user traffic (e.g., coded voice or data), and a header indicating a mobile-telephone.
  • downlink or uplink user traffic e.g., coded voice or data
  • a header indicating a mobile-telephone.
  • the header indicates a mobile-telephone to which the downlink coded voice or data is intended.
  • the header indicates a mobile-telephone from which the uplink coded voice or data was transmitted.
  • the BSC 34 is a device for controlling the resources of the base stations 32- i and for setting up the relaying of user traffic between the base stations 32- i and a land-line network (such as a public switched telephone network connected to the BSC 34 via a mobile switching center), not shown.
  • the BSC 34 includes control software executing on a processor 38 for processing and generating uplink and downlink signaling messages.
  • the base stations 32- i are devices for interfacing between mobile-telephones and a land-line network.
  • Each of the base stations 32- i includes a downlink circuitry 40 and an uplink circuitry 42 for processing data transmitted over the downlink or uplink signaling channels, respectively, as will be explained herein.
  • FIG. 7 is a simplified schematic of the downlink circuitry 40 in accordance with one embodiment of the present invention.
  • the downlink circuitry 40 includes a signal level buffer 50, a framer 52, a time slot interchanger (TSI) 54, an universal synchronous-asynchronous receiver transceiver (USART) 56, a microprocessor 58 and random access memory (RAM) 60.
  • the signal level buffer 50 is connected to the downlink path 37 to reduce the load on the T1 facility 36.
  • the signal level buffer 50 permits the base station to bridge or tap onto the downlink path without delaying or interrupting the bit stream being transmitted over the downlink path.
  • the downlink bit stream is passed through the signal level buffer 50 to the framer 52, which is a device having functionality for detecting or finding the beginning of a frame and/or a communication channel (e.g., signaling channel or traffic channel) using the framing bits.
  • the framer 52 Upon detecting the beginning of a frame or a communication channel in the downlink bit stream, the framer 52 sends an indication to the TSI 54 that the beginning of a frame or a particular communication channel has been detected.
  • the TSI 54 is a device for selectively terminating and repeating (or forwarding) data and is well-known in the art. When the TSI 54 receives the indication, the TSI 54 will know the next set of bits was transmitted at the beginning of the frame and/or over a particular communication channel.
  • the TSI 54 is configured to pass the set of bits transmitted over the downlink signaling channel (i.e., downlink signaling channel bits) to the USART 56.
  • the USART 56 is a device for examining the set of downlink signaling channel bits (or part thereof) for the presence of signaling messages, and is well-known in the art. Specifically, the USART 56 will look for the flag characters indicating the absence of signaling messages.
  • the USART 56 does not detect the flag characters (e.g., 10000001), the USART passes the set of downlink signaling channel bits to the microprocessor 58 which, in turn, will store such set of bits in the RAM 60. If the USART 56 detects the flag characters, the USART 56 discards the set of downlink signaling channel bits and does not pass them to the microprocessor 58.
  • the flag characters comprise a "1000001" bit sequence.
  • the USART 56 will transmit an interrupt signal to the microprocessor 58 indicating that the next set of bits is the beginning of a signaling message.
  • the USART 56 will transmit an interrupt signal to the microprocessor 58 indicating that the former set of bits was the end of the signaling message.
  • the microprocessor 58 examines the identifier associated with the stored signaling message to determine whether the signaling message is intended for its base station. If yes, the microprocessor will process the signaling message. If no, the microprocessor discards the signaling message.
  • FIG. 8 is a simplified schematic of the uplink circuitry 42 in accordance with one embodiment of the present invention.
  • the uplink circuitry 42 includes signal level buffers 62, 64, a framer 66, a TSI 68, a USART 70, a microprocessor 72 and RAM 74.
  • the signal level buffer 62 is connected to the uplink path 39 to reduce the load on the T1 facility 36.
  • the uplink data is passed through the signal level buffer 62 to the framer 66, which searches for the beginning of a frame and/or a communication channel in the uplink bit stream.
  • the framer 66 Upon detecting the beginning of a frame and/or a communication channel, the framer 66 sends an indication to the TSI 68 that the beginning of a frame and/or a communication channel has been detected.
  • the TSI 68 is configured to pass the set of bits transmitted over the uplink traffic channel back into the uplink traffic channels via the signal level buffer 64, and to pass the set of bits transmitted over the signaling channel to the USART 70.
  • the USART 70 will process uplink signaling channel bits in the same manner the USART 56 processes downlink signaling channel bits.
  • the signaling messages passed from the USART 70 to the microprocessor 72 will be by the microprocessor 72 in RAM 74. Note that the signaling messages passed by the USART 70 are signaling messages generated by other base stations in the wireless communication system. In addition to these signaling messages, stored within RAM 74 may also be a signaling message generated by the base station to which the microprocessor 72 is a part (i.e., receiving or current base station).
  • Signaling messages (generated by the current base station or other base stations) stored in the RAM 74 are passed back to the USART 70 on a "first-in, first-out" basis.
  • the USART 70 will pass the signaling messages from the microprocessor 72 to the TSI 68. Anytime the USART 70 does not receive a signaling message from the microprocessor to pass to the TSI 68, the USART 70 will pass flag characters to the TSI 68.
  • the TSI 68 will insert the bits passed from USART 70 into the uplink signaling channel via the signal level buffer 64, thus transmitting all the signaling messages to the base station controller.
  • present invention should not be limited to an apparatus and method for sharing a signaling channel.
  • present invention can also be used to share other communication channels. Therefore, the scope of the present invention should not be limited to the description of the embodiments contained herein.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Time-Division Multiplex Systems (AREA)

Claims (10)

  1. Verfahren zur gemeinsamen Benutzung eines Kommunikationskanals in einem drahtlosen Kommunikationssystem mit mehreren Basisstationen (32), die über eine Übertragungseinrichtung (36) miteinander in Reihe geschaltet sind, gekennzeichnet durch die folgenden Schritte:
    Zugreifen, in einer der mehreren Basisstationen (32), auf Abwärtsstreckendaten, die über die Übertragungseinrichtung (36) übertragen werden, wobei mindestens ein Teil der Abwärtsstreckendaten, der über einen ersten Kommunikationskanal empfangen wird, mindestens einen Zeitschlitz aufweist; und
    Untersuchen, in der zugreifenden Basisstation, des Teils der Abwärtsstreckendaten, um zu bestimmen, ob ein Teil des Teils für die zugreifende Basisstation bestimmt ist.
  2. Verfahren nach Anspruch 1, wobei der erste Kommunikationskanal ein Zeichengabekanal ist und der Teil der Abwärtsstreckendaten, der über den Zeichengabekanal empfangen wird, Zeichengabekanaldaten enthält, wobei die Zeichengabekanaldaten eine Zeichengabenachricht und eine Kennung zur Angabe einer bestimmten Basisstation, für die die Zeichengabenachricht bestimmt ist, aufweisen.
  3. Verfahren nach Anspruch 2, mit dem Schritt des Verarbeitens der Zeichengabenachricht, wenn die Kennung die zugreifende Basisstation angibt.
  4. Verfahren nach Anspruch 2, mit dem Schritt des Weiterleitens der Zeichengabekanaldaten zu einer anderen der mehreren Basisstationen (32) über den Zeichengabekanal.
  5. Verfahren nach Anspruch 1, wobei mindestens ein weiterer Teil der Abwärtsstreckendaten über einen zweiten Kommunikationskanal empfangen wird, der mindestens einen Zeitschlitz aufweist.
  6. Verfahren zur gemeinsamen Benutzung eines Kommunikationskanals in einem drahtlosen Kommunikationssystem mit mehreren Basisstationen (32), die über eine Übertragungseinrichtung (36) miteinander in Reihe geschaltet sind, gekennzeichnet durch die folgenden Schritte:
    Empfangen, in einer der mehreren Basisstationen (32), einer ersten Menge von Aufwärtsstreckenbit über einen Kommunikationskanal der Übertragungseinrichtung (36) von einer anderen der mehreren Basisstationen (32) abwärts der empfangenden Basisstation;
    Untersuchen, in der empfangenden Basisstation, der ersten Menge von Aufwärtsstreckenbit, um zu bestimmen, ob die erste Menge von Aufwärtsstreckenbit Zeichengabenachrichten enthält; und
    Senden, von der empfangenden Basisstation, einer zweiten Menge von Aufwärtsstreckenbit über den Kommunikationskanal, wobei die zweite Menge von Aufwärtsstreckenbit mindestens eine der Zeichengabenachrichten in der ersten Menge von Aufwärtsstreckenbit enthält, wenn der Untersuchungsschritt bestimmt, daß die erste Menge von Aufwärtsstreckenbit Zeichengabenachrichten enthält.
  7. Verfahren nach Anspruch 6, wobei die zweite Menge von Bit eine dritte Menge von Bit enthält, die zu der empfangenden Basisstation gehört.
  8. Verfahren nach Anspruch 7, wobei die dritte Menge von Bit eine Zeichengabenachricht enthält.
  9. Verfahren nach Anspruch 6, wobei die zweite Menge von Aufwärtsstreckenbit Flag-Zeichen enthält, die die Abwesenheit einer Zeichengabenachricht anzeigen, wenn die empfangende Basisstation keine über den Kommunikationskanal zu sendende Zeichengabenachricht aufweist.
  10. Verfahren nach Anspruch 6, wobei der Schritt des Untersuchens der ersten Menge von Aufwärtsstreckenbit den Schritt des Untersuchens einer Teilmenge der ersten Menge von Aufwärtsstreckenbit enthält, um zu bestimmen, ob es sich bei der Teilmenge um Flag-Zeichen handelt, die die Abwesenheit einer Zeichengabenachricht anzeigen.
EP98306557A 1997-08-29 1998-08-18 Gerät und Verfahren zur Teilung eines Signalisierungskanals Expired - Lifetime EP0899899B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/920,389 US6507575B1 (en) 1997-08-29 1997-08-29 Apparatus and method for sharing a signaling channel
US920389 1997-08-29

Publications (3)

Publication Number Publication Date
EP0899899A2 EP0899899A2 (de) 1999-03-03
EP0899899A3 EP0899899A3 (de) 1999-05-19
EP0899899B1 true EP0899899B1 (de) 2001-09-19

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EP98306557A Expired - Lifetime EP0899899B1 (de) 1997-08-29 1998-08-18 Gerät und Verfahren zur Teilung eines Signalisierungskanals

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US (1) US6507575B1 (de)
EP (1) EP0899899B1 (de)
JP (1) JPH11150757A (de)
KR (1) KR19990023998A (de)
CN (1) CN1215964A (de)
BR (1) BR9803193A (de)
CA (1) CA2244383C (de)
DE (1) DE69801728T2 (de)
TW (1) TW393845B (de)

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Publication number Publication date
CA2244383A1 (en) 1999-02-28
CA2244383C (en) 2003-02-18
TW393845B (en) 2000-06-11
CN1215964A (zh) 1999-05-05
US6507575B1 (en) 2003-01-14
JPH11150757A (ja) 1999-06-02
DE69801728D1 (de) 2001-10-25
DE69801728T2 (de) 2002-07-11
EP0899899A3 (de) 1999-05-19
KR19990023998A (ko) 1999-03-25
EP0899899A2 (de) 1999-03-03
BR9803193A (pt) 1999-10-19

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